Holding block for broaching half bearings



Sept. 25 1928.

L. C. BLOMSTROM HOLDING BLOCK FOR BROACHING HALF BEARINGS Filed July 18,1927 Gum net Pawnee Sept. 25, was.

- sire 1,685,224 sit 3; 1

LQWELL c. BLOMSTROM, or DETROIT, MICHIGAN, iissrenon 'ro FEDERAL MOGULCORPORATION, OF DETROIT, .MICHIGAN, A CORPORATION OFilVIICI-IIGAN.

nonnrne BLOCK non saoacnme HALF BEARINGS.

' Application filed July 18,

This invention relates to an improved means for holding a split shell orhalf bearing in position for action upon it by a broaching tool. and hasfor its object the firm and accurate positioning of the bearingrelatively to the path of travel of the breaching tool,and at the sametime easy and quick substitution of one bearing shell tor another eachsuccessive broaching operation is Completed. The bearing shells inquestion are those which have been previously lined or surfaced on theirconcave sides with babbitt or similarly soft material relatively to thehardened steel used in the breaching tools, and generally speaking thebreaching operation is performed after the hall hearing has been groundon the outside and bored or reamed I on the'inside.

' In the drawings} 7 V Figure 1 is an end elevational view of theholding block equipped with my improved clamping means, and showingaswell a halt bearing in position therein and the 'broach in operativeposition relatively thereto.

Figure 2 is a perspective of the block, the half bearing and "thebreaching tool.

Figure 3 is a side elevational view showing the half bearing inphantoined-in position relatively to theblock and to the broa'clnngtool.

Figure 4 is a fragmentary view of a slightlv modified form of movablelocking member rind of the adjacent part of its support ng block.

A represents a table or holding frame, in which thefblock B is heldagainst axially lengthwise movement by the bolts G or equivalent means.When the apparatus is set up, I

' the positioning of this block relatively to the path of travel of thebreaching toolD is made a matter of great care and accurate adjustmentas by manipulation of flanking or lateral adjustment screws N on eitherside, so that as the broaching tool proceeds lengthwise of the block,the half-bearing E, which 7 lies within the recessed or troughed centerportion of the block, will'be acted upon to just the'degree, generally amatter of minute thousandths of an inch, required as to it bab bittlining. The holes C in the body of the block B, in which the screws Cengage, are preferably made slightly elliptical in shape, with thecross-sectionally long axis extending transversely of the axis oftheholding block B, in order to make possible this relatively 1927. SerialNo. 206,524.

relative lengthwise movement thereof; Along slight screw-actuatedadjustment of the block W a crosswise of the frame A, while preventingone top edge of the block is positionedthe plate F, either madeintegralwith, the body'- of the block, or originally separate and at tachedtheretoby screws or bolts G, with its inner edge projecting over the:central portion of the block. The insertionandremovability of a halfbearing from this position is of course easy so long as its otherstraight edge is not overengaged by the-slid ling stop or plate H, whichis similarly posi- V tioned on the other side of the block B. This 7plate l-I is'rnade slidable with reference to the tracted by pull uponthe handle J, against the 1 draw ot-the spring K, its interior edgeclears" the outer line of the inserted half bearing E;

. block suflicientlyso that when it is ree V but when the handle orknob, J .is released, it

'is thrown inwardly relatively to the block sufficiently to overengagethe adjacent straight edge of the half bearing-Ey ball its inwardprojection to an" undesired degree,

that is, to such an extentthat it would strike I the broaching tool D,is prevented by the engagement of the depending lip L against the sideof the block, The method of use of this device is thus apparent. Whenthe slide plate H isdrawn outwardly, a half bearing is slipped intoposition and the-slide plate-H allowed to move; to its holding positionwith reference to the half bearing, which, due, to the described actionof the slideplate Hand the fixed plate F is thus heldagainst' rockingI1]OtlOI1 WllIhlI1 the block, so that an accurate broachmg operation bythe tooll) can be -performed. The possible lengthwise slipping of thebearing E within the block isprevented by the presence of the stop M,which abuts in front of the'forward edge of the bearing E.

Thus to all intents andpurposes asreg'ards possible slippage during thebreaching operation, the bearing E is made an integral part ofthe blockB, whose previous accurate positioning relatively to the path of travelof the broachingtool D has already been emphasized. I

While it has been my experience that the slide plate H is the mostsatisfactory form of movable holding medium, for cooperation with thefixed overengaging shelfior plate F,

V employ sition for breaching, comprising, in combinat-ien with a baseblock provided with a seat of suitable contour, a fixed shelf projectingover one lateral edge of the bearing seat, under which one edge of thehalf bearing is adapted to be slippedwhen the latter is first placed inits seat, and aslidable holding piece adapted to be moved transverselyof the axis of the half bearing for accurate engagement over theupturned opposite edge of the latter.

,2. Aholding block for a half bearing during breaching, comprising asemicircularly recessed seat overengaged on one edge by an inwardlyprojecting shelf, and a slide piece adaptedto similarly overengage theother edge after the half hearing has been seated therein, the retractedposition of said slide piece-while the half bearing 18 being seatet andremoved respectively being over that portion of the side of the blockoutside the recessed portion.

3."A holding block for a half bearing Whose breaching is intended,having a central seat portion'of complementary semi-circular contour tothat of the half bearing, an

inwardly, projecting shelf over-engaging one straight edge of the bearng when seated, an d a transversely movable slide. piece adapted to beplaced in position of holding overengagement relatively to the otherstraight edge of the bearing, both the shelf and the slide piece beingclear of the line of travel of the breaching element as it operates uponthe half bear- 4.'In combination with a suitably contoured base blockadapted to be placed in axial alignment With a broaohing'toohmeans forrigidly holding a half bearingin position therein, comprising a shelfunder which one edge of the half bearing is adapted to be relatively toforced when the latter is seated in the base block, and a transverselymovable slide adapted to be moved into holding engagement over the otheredge of the half bearing from that engaged by the fixed shelf, thoughout of line i with the path of travel of the breaching tool as it movesaxially lengthwise of the half bearing.

5. Means for holding a half bearing in position for breaching,comprising a longitudinail tr'oue'hed base block a fixed holdin ele- Q I7 7 I a ment on one s de thereor tor overengaglng one straight edge of ahalf bearing positioned within the trough, and a transversely movmemberadapted to be moved position of over-engagement the other straight edgeof the aole holding into and out half bearing.

6. A holding block for a half bearing during breaching, having alongitudinally.

troughed central portion of con'ipleinentary contour to that of the halfbearing, a plurality of fixed stop elements carried by said holdingblocs, onewadapted to resist length-.

wise inovei'nent of the half bearing relatively to the block and theother adapted to resist its rocking movement, and a movable holdingplate adapted to be moved into and out of overengaging positionrelatively to the other straight edge of the half bearing, therebycooperating with the latter of said fixed holding means in preventingrocking movement of the half bearing during the breaching operation. I v

7. In combination with a frame and a breaching tool adapted to operatethereever, a holding block for a halt bearing whose bro-aching isdesired, adapted to be accurately positioned relatively to the path oftravel of the breaching tool, said holding block being centrally groovedfor the reception of the half bearlng and said groove beingandmarginally overengaged on one side by a hold itagainst rocking duringthe breaching operation.

In testimony whereof I sign this specificatien,

LOWELL e; n oi isrno vt

